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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Immunology

Signs and Symptoms: Why Your Body Struggles to Fight Back

At a Glance

Adult-Onset Immunodeficiency (AOID) causes the body to produce autoantibodies that block the immune system's ability to fight off certain germs. This leads to severe, recurring opportunistic infections, chronic fevers, swollen lymph nodes, and skin rashes like Sweet's syndrome.

If you have been struggling with infections that simply won’t go away or keep coming back, understanding how Adult-Onset Immunodeficiency (AOID) works can be a breakthrough. In this condition, your body produces autoantibodies that block interferon-gamma (IFN-γ), a critical “chemical messenger” [1]. Without this messenger, your immune cells (macrophages—the “pac-man” cells of your immune system that eat germs) cannot receive the signal to destroy certain germs that hide inside your cells [2][3].

This explains why infections that are usually manageable become refractory (resistant to treatment) or relapsing (returning after treatment stops) [4][5].

Common “Opportunistic” Infections

Because the “kill signal” is blocked, your body becomes vulnerable to opportunistic infections—germs that take advantage of a weakened immune system [6].

  • Nontuberculous Mycobacteria (NTM): These are cousins of the bacteria that cause tuberculosis (TB). They are found in soil and water and are the most common infections in AOID [7]. They often affect the lungs, skin, or lymph nodes and can mimic the appearance of lung cancer or TB on scans [8]. Because NTM is everywhere in the environment, you may need to adjust some daily habits to stay safe. Actionable steps include avoiding hot tubs, wearing masks and gloves if you must garden (though avoiding potting soil altogether is safer), and potentially using specialized filters on your showerheads [9].
  • Talaromyces marneffei: A fungus common in Southeast Asia that can cause severe illness, including high fevers, anemia, and distinct skin spots [10][11].
  • Salmonella: While most people think of food poisoning, in AOID, Salmonella can enter the bloodstream and cause persistent infections in the bones or other organs [9].
  • Cryptococcus: A fungus that can lead to serious infections in the lungs or the lining of the brain (meningitis) [12].

Non-Infectious Symptoms and “Red Flags”

AOID does not just cause infections; it also triggers intense inflammatory responses as the immune system struggles to find its balance.

  • Sweet’s Syndrome: Also known as acute febrile neutrophilic dermatosis, this is a classic sign of AOID [13]. It appears as painful, red skin plaques or nodules, often accompanied by a high fever [14].
  • Prolonged Fever and Night Sweats: Many patients experience months of “unexplained” fevers and heavy sweating while doctors search for the underlying cause [15].
  • Lymphadenopathy: This is the medical term for swollen lymph nodes. In AOID, these can become very large and may be mistaken for lymphoma (a type of cancer) until a biopsy is performed [16].
  • Bone Infections (Osteomyelitis): Bacteria or mycobacteria can settle in the bones, causing deep, aching pain that is often difficult to pinpoint [17].

Why Standard Treatments Often Fail

You may have noticed that traditional antibiotics don’t seem to “finish the job.” This is because the drugs kill many of the germs, but your body lacks the internal signal (IFN-γ) to clear the remaining ones [3].

To break this cycle, doctors often have to use a “two-pronged” approach:

  1. Powerful Antimicrobials: Long-term courses of specialized antibiotics or antifungals to keep the germs in check [4].
  2. Immunotherapy: Medications like rituximab to lower the level of autoantibodies, effectively “unmuting” the immune system so it can start fighting again [18][19].

Recognizing these patterns—the relapsing infections, the skin rashes, and the “cancer-mimicking” scans—is a vital step in getting the right targeted treatment for AOID.

Common questions in this guide

Why do standard antibiotics often fail to cure my infections?
In AOID, standard antibiotics may clear some bacteria, but the body lacks the internal interferon-gamma signal needed for immune cells to destroy the remaining germs. This often requires a combination of long-term antimicrobials and immunotherapy to successfully clear the infection.
What is Sweet's syndrome and how is it related to my immune system?
Sweet's syndrome, also known as acute febrile neutrophilic dermatosis, is a common inflammatory sign of AOID. It causes painful, red skin plaques or nodules and is frequently accompanied by high fevers.
Do I need to make changes to my home environment to avoid infections?
Patients with AOID are highly susceptible to Nontuberculous Mycobacteria (NTM), which lives in soil and water. To reduce your exposure risk, you may need to avoid hot tubs, steer clear of potting soil, and use specialized water filters on showerheads.
Can AOID cause swollen lymph nodes that mimic cancer?
AOID can cause severe swelling of the lymph nodes as the immune system struggles to fight off opportunistic infections. These swollen nodes can become very large and are sometimes mistaken for lymphoma on imaging scans until a biopsy confirms the true cause.
What specific opportunistic infections should I be watching for?
People with AOID are vulnerable to germs that healthy immune systems normally fight off. Common examples include Nontuberculous Mycobacteria (NTM) in the lungs or skin, Salmonella in the bones, and serious fungal infections like Cryptococcus or Talaromyces marneffei.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Have any of my recent infections been identified as Nontuberculous Mycobacteria (NTM) or Talaromyces marneffei?
  2. 2.Is the skin rash I experienced (or am currently experiencing) Sweet's syndrome, and how does that relate to my immune system?
  3. 3.Do we need to perform imaging to check for bone infections (osteomyelitis) or lymph node involvement that might be mimicking other conditions?
  4. 4.Are there specific fungi or bacteria we should be proactively screening for because of my anti-IFN-gamma levels?
  5. 5.Do I need to make specific adjustments to my home environment, like installing water filters or avoiding yard work, to reduce my exposure to NTM?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
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    Blockade Effects of Anti-Interferon- (IFN-) γ Autoantibodies on IFN-γ-Regulated Antimicrobial Immunity.

    Krisnawati DI, Liu YC, Lee YJ, et al.

    Journal of immunology research 2019; (2019()):1629258 doi:10.1155/2019/1629258.

    PMID: 31275997
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    Anti-Interferon-γ Autoantibodies Impair T-Lymphocyte Responses in Patients with Talaromyces marneffei Infections.

    Chen ZM, Yang XY, Li ZT, et al.

    Infection and drug resistance 2022; (15()):3381-3393 doi:10.2147/IDR.S364388.

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    Th1 cell immune response in Talaromyces marneffei infection with anti-interferon-γ autoantibody syndrome.

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    Natural History and Evolution of Anti-Interferon-γ Autoantibody-Associated Immunodeficiency Syndrome in Thailand and the United States.

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    Treatment Dilemmas in Disseminated Nontuberculous Mycobacterial Infections With Interferon-gamma Autoantibodies.

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    Multiple refractory intracellular pathogen infections in a human immunodeficiency virus-negative patient with anti-interferon-γ autoantibodies: a case report.

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    BMC infectious diseases 2023; (23(1)):493 doi:10.1186/s12879-023-08404-8.

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    Multiple intracellular pathogen infections with ocular pathologies associated with adult-onset immunodeficiency due to anti-interferon-γ autoantibodies: a case report.

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    Disseminated Mycobacterium kansasii infection with osseous involvement in anti-interferon-γ autoantibody-associated adult-onset immunodeficiency: a case report and literature review.

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    Case report: Diagnosis of Talaromyces marneffei infection in an HIV-negative patient with septic shock and high-titer anti-interferon gamma autoantibodies by metagenomic next-generation sequencing.

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This page explains the signs, symptoms, and opportunistic infections associated with AOID for educational purposes only. Always consult your immunologist or infectious disease specialist for an accurate diagnosis, specialized testing, and medical treatment.

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